I'd think that very unlikely. The form of decoration on our versions of 555817 - a kind of fruit salad of raspberries etc. - would, in my humble opinion, put them firmly post 1960 manufacture - and I don't get the impression that they were that popular even then.
As for the inclusion of marks etc., Stuart pieces can be found with name plus Rd. No. - just the name - just the Rd. No. - and of course (although on balance less commonly) without either name or No.
If you look for example at Miller's reproductions of Stuart designs, Charles Hajdamach, the Hayhurst & Benson booklet and some of the cut designs in Stennett Willson's books, you'll see that with very few exceptions - i.e. the Woodchester Fern, the odd grape and vine and rarely one or two fish plus the odd seagull - it was heavy geometric cutting that dominated in the pre 1940-50 period FOR GENERAL GLASS PRODUCTION - not the realistic wheel engraved fruit decoration such as ours.
I'm well aware of the very animated decoration on the enamelled wares, and some of the Dame Laura Knight type of haute couture designs, but they were much in the minority, and anyway we're speaking here of proper cut designs only.
So I think these fruit decorated pieces are definitely much later. I've attached pic of another of these oval shaped bowls, this time without any fruit, and this has Rd. No. 555817 scratched with diamond point, at one end inside a mitre. Off the cuff I'd have thought this rather straightforward geometic pattern might pre-date the raspeberries etc., but really am only guessing.
here is a link to selection of early Stuart catalogue pages, provided by bOBA (Robert) showing the heavy geometric cutting............ http://picasaweb.google.com/RobertLBJ/StuartsCrystalGlassGlassCutterMrCorfieldSPatternDrawingsEtcC19171921?authkey=Gv1sRgCK3c9dnFp-bSIA&feat=directlink
and some much more recent pages of designs which I believe were provided by Ross - although drinking glasses seem to pre-dominate here, although there are some bigger pieces toward the end..........http://glassgallery.yobunny.org.uk/thumbnails.php?album=938
It's possible that Nigel Benson has copies of original Stuart catalogues and he might be able to suggest a more accurate date for our versions of 555817, with the fruit etc., but I'd be very surprised it they did pre-date the early 1960's
Stuart seemed quite keen on this oval shape - sometimes you find a similar bowl with inner shelf profile, but with vastly less decoration and occaisonally they are seen with the 'S' for Stonier somewhere near the base. I have a feeling that the oval shape was not uncommon in the Georgian/Regency period - I've one or two bases of similar desing, although I don't have the lids that may well have accompanied them.